utm.codes doesn’t provide reporting functionality, it’s a link builder to allow you to easily create and manage consistent links for better reporting no matter what analytics platform you use.
The links you create with utm.codes will work with any analytics platform that supports campaign reporting (sometimes referred to in documentation as “query string” or “parameter” data). Google Analytics, Matomo, Plausible, Simple Analytics, and many, many more provide reporting that utm.codes links will work with to give you better insight into your site traffic.
Reviewing the link you shared it looks like you’re using Google Analytics. To review reporting for your utm.codes created links in Google Analytics you’ll probably want to start with the Acquisition reports (Channels, All Campaigns, etc.).
Here’s a few links with additional details for various analytics platforms.